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5 metres of cloth cost 210. The cost of 10 metres is:
A105
B630
C420
D210
Answer & Solution
Correct answer: C. 420
1. Length and cost are in direct proportion.
2. Double the length doubles the cost.
3. So 10 metres cost 420.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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